Burglar-alarm



(No Model.)

W. F. H. OKEBPB'.

A BURGLAR ALARM. 110.311,02?. Patented Jan. 20,1885.

WITNESSES N PETERS4 Ps-nlmLlllwgmpher. wasmngmn D. C.

UNITED STATES PATENT OFFICE.

WARNER F. H. OKEEFE, OF ALLEGHENY CITY, PENNSYLVANIA.

BURGLAR-ALARM.

SPECIFICATION rorming part of Letters Patent No. 311,027, dated January20, 1885.

A pplicaton filed March 4, 1884.

T0 all whom it may concern,.-

Beitknown that LWARNEE F. H. OKEEFE, a citizen of Allegheny City,residing at Allegheny city, in the county of Allegheny and StateofPennsylvania, haveinvented certain new and useful Improvements inBurglar-Alarms; and I do declare the following to be a full, clear, andexact description ofthe invention, such as will enable others skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters and iigures ofreference marked thereon, which form a part of this specification.

lVIy invention relates to burglar alarms adapted to be operated by beingtrod upon.

The invention consists in the combination, with spring-metal electrodes,of a yielding or elastic connection, as fully described hereinafter.

In the drawings, Figure l represents a plan view of my improvement, andFig. 2 is a longitudinal central section of the same.

A represents a base or block upon which are secured oppositely-arrangedspring-arms B B, formed preferably L-shaped, and adapted to serve aselectrodes. The outer ends of these arms B B are each provided with abindingpost, C, to receive the wires D D, which latter are connectedwith a battery and lead to an alarm of any preferred character. Theinner ends of the arms B B are bent in opposite directions to embrace ashort rubber tube or ring, E. I prefer to employ an ordinary rubber tubeor ring; but the ring E may be made (No model.)

of any suitable yielding non-conducting material.

It will be apparent that the spring action of the arms B B will serve tohold them normally apart, thus breaking the circuit of the electricalcurrent from the battery. The pressing together of thc arms B B until acontact is ei'- fected will, however, complete the circuit and operatethe alarm.

The device as thus described is adapted to be concealed beneath a carpetor matting, and to be trod upon, and will be of service as a signaldevice, as well as an alarm.

I am aware that it is not broadly new to conceal a circuit-closerbeneath a mat, so that the circuit will be closed when the mat is trodupon; hence I make no broad claim to such a combination.

Having fully described my in vention,wh at I claim as new, and desire tosecure by Letters Patent, is-

In a burglar-alarm, the combination, with the wires of a battery, of abase or block, spring-arms secured at their outer ends to said base andprovided with binding-posts, while their inner ends are oppositely bentto embrace a yielding connecting-ring, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

VABNER F. H. OKEEFE.

lVitnesses:

F. M. TIEENAN, J As. B. BEALE.

